when did u ladies start feeding ur babies cereal or baby's food in a high chair? what age?

My son is 6 months and I put a bib on him and feed him on his boppy pillow. Not in a high chair, he falls over

@arians_mommy, Oh ok my son is 5 months..he can't quite sit up by himself yet but I was gonna try to start him sitting in one to get him used to it...but I may want another month or so